Electric transmission of intelligence.



W'tm W No- 828,217. PATENTBD AUG, 7, 19-06.

I. KITSEB.

ELECTRIC TRANSMISSION OF INTELLIGENCE. APPLICATION FILED JUNE 28,1906-Imaomor rill NORRIS ltrlk: cm, uln'sumarun, n. a

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ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC TRANSMISSION OF INTELLIGENCE.

Specification of Letters Patent. v

Patented Aug. '7, 1906.

Application filed June 23, 1906. Serial No. 323.065.

To all whom, it may concern.-

Be it known that I, ISIDOR KITSEE, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inElectric Transmission of Intelligence, of which the following is aspecification.

My invention relates to an improvement in electric transmission ofintelligence. Its ob ject is to provide means whereby circuits used forthe transmission of electric intelligence may be made immune fromdisturbing influences.

Cases arise where circuits used for telephonic purposes are carried overland for a certain distance, the precaution to make this circuit allmetallic and to transpose the same at intervals being sufficient to freeit from the induction of neighboring telegraphic or telephonic wires;but when power-wires are carried on poles near byas, for instance, isthe case on the New Haven road-these usual precautions do not sufiice tokeep the circuit clear from inductive influences. In such cases it isbest to carry the overhead circuit only to a point out of the region ofthe power wire and to connect the metallic circuit then to a circuitadapted to inductively carry the impulses either to the point ofdestination or to a second metallic circuit, and in the draw- I-haveillustrated such an arrangement.

The drawing illustrates in diagrammatic view two metallic telephoniccircuits joined together by an inductive circuit.

The inductive circuit embraces the wires 1, 2, 3, and 4, the wires 1 and2 being inductively twisted together, and the wires 3 and 4 are arrangedin the same manner, so that 1 and 2 form one pair and 3 and 4 the otherpair of wires. 6 and 7 are the two legs of a -metallic circuit includingthe secondary 8 of an inductorium and the receiver 9. The two legs 6 and7 are connected together with the interposition of an inductiveresistance, such as an electromagnet of preferably high-resistancevalue. The primary 10 of the inductorium is here shown as to beconnected locally to the transmitter 12 and the battery 11; but it isobvious that where the metallic line starts or is connected in a centralstation the usual devices may be placed in said line.

Of the inductive circu1t one wire of one pair,

here shown as the wire 2, and one wire of the second pair, here shown asthe wire 4, is connected to the inductive resistance 5 on the left-handside, and the wires 1 and 3 are connected to the inductive resistance onthe right-hand side. In reality we have two circuits, one circuitembracing the wires 1 and 3 and the other circuit embracing the wires 2and 4. These two circuits are in inductive relation to each other, butare conductively independent of each other.

In my experiments I have used inductive devices of a resistance as highas five thousand ohms and of a self-inductance of about forty-fourhenries, and I used an inductive circuit of nearly forty miles withsatisfactory results.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In electric transmission of intelligence,

the combination of two metallic terminal circuits joined togetherinductively through a four-wire twist.

2. In electric transmission of intelligence, an all-metallic lineprovided with necessary transmitting and receiving devices, a resistancejoining the two legs of said line and an inductive circuit comprisingfour wires divided into two pairs, one wire of each pair connected tosaid resistance.

3. In electric transmission of intelligence, a metallic circuit, aninductive resistance closing said metallic circuit for each terminal anda circuit joining inductively the two inductive resistances.

4: In electric transmission of intelligence, an all-metallic lineprovided with necessary transmitting and receiving devices, an inductivecircuit comprising two pairs of wires, the two wires of each pairtwisted in intimate relation as to each other, one wire of one pairconnected to one leg and one wire of the other pair connected to thesecond leg of said metallic circuit; a second metallic circuitcomprising necessary transmitting and receiving devices, one leg of saidmetallic circuit connected to the free wire of one pair and the secondof said legs connected to the free wire of the secondpair of saidmetallic circuit.

In testimony whereof I affix my signature in presence of two witnesses.

ISIDOR KITSEE.

Witnesses I ALvAH RITTENHOUSE, Enrrn R; STILLEY.

